(D) The $CuCr_2O_7$ salt dissociates in water into $Cu^{2+}$ and $Cr_2O_7^{2-}$ ions. $Cu^{2+}$ ions exhibit a blue colour in aqueous solution. $Cr_2O

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$Cu^{2+}$ ions are blue and $Cr_2O_7^{2-}$ ions are yellow

(D) The $CuCr_2O_7$ salt dissociates in water into $Cu^{2+}$ and $Cr_2O_7^{2-}$ ions. $Cu^{2+}$ ions exhibit a blue colour in aqueous solution. $Cr_2O_7^{2-}$ ions exhibit a yellow colour in aqueous solution. When these two colours are mixed,they produce a green colour. Therefore,the correct option is $D$.